ECTOSTOSIS
\ˌɛktəstˈə͡ʊsɪs], \ˌɛktəstˈəʊsɪs], \ˌɛ_k_t_ə_s_t_ˈəʊ_s_ɪ_s]\
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By William R. Warner
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Formation of bone in which the ossification begins under the perichondrium and either surrounds or replaces the cartilage.
By Henderson, I. F.; Henderson, W. D.
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Ossification beginning underneath the perichondria.
By Willam Alexander Newman Dorland